Melting pot for type-forming machines



1933- H. T. SUNDSTROM HELTING POT FOR TYPE FORMING MACHINES Filed May 16, 1930 gran/WM Herman T. undslrom.

Patented on. 17, 1933 M ofone half to Walter B. Nail, Houston; Tex; 7 Application May 16.11930. Serial-No. 452,826,

' frciaim .(oi. 263 f14)" My invention relates tothe construction'of'the melting pot forthe metal used in type-forming machines such as linotype machines and the like.

In the melting now generally used'to sup ply the metal employed in casting the typ'e, it is necessary to heat the crucible to about 550? F. o that the lead' will be or the right fluidity to cast well. Also the outlet spout from themelt ing pot through which the molten lead passes ,to the mold must be of approximatelyrthe same temperature .so that the lead will not becooled before it: enters the mold andso that the feast line of type may be easily detached fromthe dis harge 1 eni o m nt i t d har spout of uniform high temperature it has been customary to provide a gas burner separate from the burner for the crucible and to then'errip'loy a'third burner adjacent the outlet 'nozzle for the lead. 1 Thisarrangernent has many objec tions in that the burner at the outlet cannot be set to burn too strongly or the discharge nozzle plate is warped. .If the flame is set low it frequently goes out.

It is an object of this invention to provide a structure for the melting pot and the burners thereof-whereby the discharge port for the lead may be kept at the uniform temperature desired and the whole construction of the pot materially simplified. Y p

I also wish to arrange to control the heating means for the outlet port so that it will be uniform and to disconnect the gas supply to the spout burner from the supply to the crucible burner and then prevent the varying of the heat supply to the outlet passage by the thermostat which controls the heat'to the crucible. 1

The main idea of the improvement lies in the simplicity of the heating apparatus for the outlet pipe for the molten lead and the obtaining of, a more uniform" and continuous heat necessary,

in obtaining the best results 1n casting of the the heat from s portion of the melting p t m I 7 typ slug.

V In thedrawing herewith Fig. 1 shows a central vertical section through the melting pot with the burner and its connection.

Fig. 2 is a perspective detail of a plate which I employ to close the draft opening ordinarily included in the usual melting pot. V

Fig. 3 is a detail sectional view of one of the joints in the pipe shown in Fig. 1.

In carrying out my invention I have under contemplation the modification of the usual melting pot as now employed, and in Fig. l the already old and now in common use. i Referring particularly tQFigJI, the potim cludes'anfo'uter housing 1, the rearward side of general construction of-the pot' is similar to matwhich is practically cylindrical and the forward .1:

side of which-is curved forwardly'at '2. Thef'up per 1 forward -"side" has a discharge I sort; 3 'f or the, metal. ilielowthis discharge port' there isfordi na'ril'y an opening '5, which is" a sort of draftj-opem mg, and in this opening there is usually a t'llbu 5.

larfburner fitting within an'opening 4 in the side wall of' the opening 5. The lower end-"offthe housing is open at 6 to allow the insertionof the burneran'd its connections. M

The housing'thusi provided has therein a cru-f cible or pot 7, inwhichjthewlead i s -pl'a ced mg; melting. The forward sideiofthe meltingpot is;

inclined' upwardly-towa'rdthe" outletport forthe lead. Approximately centrally of the merung' ot is a cylinder 8 thelower end of opens into 5,

an outletspout 9;which is cui ved'upwardly;[and I forwardly 'to' terminate -at* the discharge, port 3. v This construction is old and it is to be understood that the cylinder 8 is adaptedto, receive'apiston, H

not shown, by-means of which lead maybe forced 92.-

from the melting pot out the discharge port 3.

which the lead is dischargedto the mold which is forced against the discharge nozzle 3 when the 3:.

cast is to be made. I g

The upper side of the housing has a cover 12 thereon in which is an opening 13, ordinarily closed by a lid and through which the lead may be fed to the crucible. The forward side of the cover 9?,

is a chamber 14 separated from the main body- I of the crucible by a'wall-15; This chamber 14 ter- 5' minates in a chimney 16, opening upwardly-,to allow the escape of the fumes from the burner.

There is a channel or passage indicated in dotted lines at 17 leading from the chamberl9 below the outlet passage upwardly to the chamber .114 so that find an'outlet upwardly. 1

The main burner 20 is of ordinary construction 9 gas or similar fuel through a pipe22 having air inlets thereto beneath the shield 23 on said pipe.

Below the air inlets is a valve 24 through which the'supply of gas through the pipe 25 may be regulated. The gas supply, to the burner is admitted I Y through a pipe 26 at the forward side and it will 31 thereon and the inlet pipe 32 connected with the supply pipe 26. In the old constructionthe gas supply to the burner tubes 29came by way of a connection 33 with the supply pipe .25. ,This supply would thus be controlled bythe'thermostat and each time lead was dropped into the crucible,

thus tending to lower the temperature of 'thecrucible, the thermostat would have the efiect of turning on more gas and delivering a hotter flame into the-.crucible until the new lead was melted. A full supply of gas .wouldthus also be delivered totheburner tubes=29 with the result that whenever :new lead was v dumped into the ;melting :pot theoutlet passageiandztheloutlet port 3 wouldbe.

overheated and damage :to .-the apparatus would occasionallyresult and in any case the-lead might be'more fluid; than was particularly desired.

.-In mypresentconstruction the pipeBO is connected with the pipe; 32, as: shown in Fig. 3, but the connection by way-of the pipe 33 is eliminated, and-a-solidrod or support takes the placeof the tubulanconnection.

As a further changeiin connection with. the de- 5'? vice I eliminate the burner. at the point 4 and close the opening .between the walls ,5 by means of 'a plate34. This plateis-shownaparticularly-inFig.

2 :Itis connected with thehousing by means of.

, screws-35m the forward side-of the opening and iswextendedlrearwardly toentirely close this port or opening through-which .thedraft -was supplied in the old construction. An inwardly -turned flange 36 at one end of the plate is necessary to close the opening through which the old burner would be projected.

It is to be understood that in the old construction there wasa baffle across the passage 19 at the point indicated by the screw head 37, but in my, present construction thisbaflieis eliminated and the heat from the burner tubes 29 may 'pas'sup 7 through the chamber 19 and around beneath the lower side of the discharge passage and up ,through the outlet 1'7 to the chamber 14 and then 2 out through the chimney 16. i .In the use of my device the operation of melt- "ing the lead and discharging the same to the mold is identical with the old construction. I am enabled, however, bypassing the heat from the burner tubes 29 upwardly around the discharge port without the supply of cooling air through the port 5. and thus obtain an equal heating of this tube such as is particularly desired. Avalve 40 -in'the supply tube 32 will enable the operator toregulate the heatin this passageto obtain-the uniformity which was unobtainablein thelold .de-T

vice and I also am enabled to eliminate an extra burner usuallyernployedat the point 4 .,as has been described. .Ithas. also been found-an improvement to eliminatethe thermostatic control of the burner29 which in the oldformcaused unequal-heatandoccasional warping ofrthe discharge device through which the leadIisdelivered to'the mold. I I f i 7 What .I claim -as new is:

A-melt ingfpot of the character stated" including I a housing, a crucible therein, an 1 outlet spoilt thereon having avdischarge nozzle a metal .heattrol said .heater, a spout .heater spaced upwardly therefrom for saidspoutand nozzle and free of .110 erlbelow said crucible, thermostat n'ieansto .'con

control from said" thermostat," a 'chimneyabove said spout, .anda laterally closed passage from said heaterabout said spout'to said chimney, c y I HERMAN r. sUNDsTR M. 

